A forensic scientist uses paper chromatography to analyse two dyes, C and D, from a security label. Water is used as the solvent. The dyes are equally soluble in water.
| Measurement | Distance from the origin line in mm |
|---|---|
| Centre of the spot for dye C | 28 |
| Centre of the spot for dye D | 64 |
| Solvent front | 80 |
Calculate the Rf value of each dye.
Explain which dye was more strongly attracted to the stationary phase. Identify the stationary phase in your answer.
113 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.